This is the hub as used in the Nimbus Signature range of unicycles. It is built to be more robust and durable than the traditional cotterless hub. ISIS spline is strong and creak free Tempered 4130 CrMo spindle Wide flange spacing for increased wheel strength. White powder coat finish Flange material hardness and shape are designed to maximise spoke strength. Sealed, 42mm bearings with standard 100mm spacing Available with 36 spoke holes Comes with pair of ISIS bolts. Weighs: 600g (635g including bolts and spacers) Hub flange width (W) = 74.5mm Hub flange Diameter (D) = 56.5mm Hub hole Diameter (S) = 2.8mm Information on the spoke length for building a wheel can be found on our Spoke Calculator